.question {
    width: 100%;
    overflow: auto;
}

.topic_collection {
    width: 98%;
    margin: auto;
    line-height: 50px;
    height: 50px;
    border: 1px solid black;
    border-radius: 5px;
}

.question_font {
    font-family: "微软雅黑";
    margin-left: 10px;
}

.leftFolat {
    float: left;
}

.topics {
    width: 98%;
    margin: auto;
    line-height: 50px;
    overflow-y: auto;
    margin-top: 15px;
    box-shadow: 5px 5px 10px 5px #ccc;
    border-radius: 5px;
}

.topic {
    float: left;
}